HP ML370 G6 server (RDX drive will not register)

I have been trying to figure out why my RDX drive will not register. Ive done all the tricks I know to get it to register to no avail, Googled some I didn't know. Even went about swapping the Physical RDX drive with a spare we had on hand (including the wires. I reinstalled the drivers. None of this worked. Please help.